1. Environment

2. Environment 100
What is the greatest source of carbon dioxide and why is carbon dioxide significant?

3. Define bioaccumulation.
Environment 200
Define bioaccumulation.

4. What is the function of autotrophs in the carbon cycle?
Environment 300
What is the function of autotrophs in the carbon cycle?

5. Environment 400
Write a food chain with four organisms. Label each with its role in the ecosystem.

6. Environment 500
The world is extremely diverse in life, but yet all organisms have the same four nucleotides and same set of amino acids. How is this possible?